 import std.stdio;
 import std.socket;
 
void show(int a) @safe
{
    writeln("a is : ", a);
    show2();
}

void show2() @trusted
{
    writeln("@system");
}

void main()
{
    show(3);
    Address addr = parseAddress("127.0.0.1",8081);
    
    writeln(addr.toString()," ", addr.addressFamily);
    
    addr = parseAddress("0.0.0.0",80);
    writeln(addr.toString()," ", addr.addressFamily);
    
    
    addr = parseAddress("0::0",80);
    writeln(addr.toString()," ", addr.addressFamily);
    
    addr = parseAddress("0.0.0.0");
    writeln(addr.toString()," ", addr.addressFamily);
}
